Center-grinder attachment for lathes.



No. 680,845. Patented Aug. 2u, 190|.

' H. Doen.`

CENTER GBTNDER ATTACHMENT FOB LATHES.

(Application filed Mar. 15, 190i.)

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No. 680,845. Patented Aug. 20, l90l. H. DUCK.

CENTER GRINDER ATTACHMENT FOR LAT-HES.

(Appncmion mea mr. 15, 1901.) (Nn Model. 2 Sheets-Sheet 2,

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ltlni'rnn @raras Partnr @maca HERMAN DOCK, OF PHILADELPHIA, PENNSYLVANIA.

CENTERnGRINDER ATTACHMENT FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 680,845, dated August 20, 1901. Application led March 15, 1901. Serial No. 51,279. (No model.)

.To au whom it may oon/cern.'

Beit known that I, HERMAN DOCK, a citizen of the United States, residing at Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented a new and useful Improvement in Center-Grinder Attachments for Lathes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to machines which are used to grind the centers of lathes.

The object of my present invention is to provide a single machine which will grind lathe-centers at any angle desired and vary the angle of the grinding-wheel, so as to obtain the desired angle on the centers, so that with one attachment centers of dierent angles may be ground.

The invention also contains improved details of construction whereby the operation of the device is improved.

Broadly considered, I accomplish the main object of my invention by providing a bearing for the revoluble spindle of thegrindingwheel, which is supported so as to be movable to vary the angular position of the grinding-wheel with reference to the center to be ground. I make the bearing movable upon its support and guided by means of a groove. I further provide locking mechanism to maintain the bearing, and with it the grinding- Wheel, fixed in the desired position.

The detail improvements of my invention will be more apparent by reference to the drawings, in which- Figure l is a plan view of a portion of the lathe with my improved center-grinder centered on the lathe. Fig. 2 is an enlarged plan view of the center-grinder, showing the center in position to be ground. Fig. 3 is a front view of my improved machine. Fig. 4 is an end view of the same. Fig. 5 is a detail sectional view through projection L7'2 on line 5 5 of Fig. 2.

A is the bed-plate of a lathe; B, the faceplate on the shaft b, on which are the driving-pulleys h.

C is the slide-rest, carrying the tool-rest c. The slide-rest C is movable longitudinally and transversely upon the bed of the lathe,

the hand-crank c operating for the transverse movement and the wheel c2 for the longitudinal movement.

D is the tail-stock, movable longitudinally on the bed-plate. In the face-plate B is placed the live-center d of the lathe, and in the tailstock D is placed the dead-center cl, all as in the ordinary lathes.

My center-grinder attachments consist of the following.

E is the main support or frame of the center-grinder attachment,having the depending post c. Surrounding this post is the split sleeve e', having the set-screw c2 for clamping it around the post.

F is a projection from the sleeve c', having the slot f for attachment to the tool-rest c.

G is the'main driving-wheel for the grinding attachment. This wheel G is rotatably mounted upon a projection g from the support E. The drivin g-wheel G is a gear-wheel. Meshing with the gear-wheel G is the gear g on the shaft g2. This shaft g2 is supported in bearings in the hanger II. This hanger I-I is pivotally supported at one end upon the support E at h, which point is in line with the center or gear wheel G. The other end of the hanger II has a base-plate II", having a projection entering the concentric groove Hgin the projection g. Splined upon'the shaft g2 is the pulley-wheel I. Through the projection g is formed the elongated lateral orifice g3. Projecting through this orilice g3 is the spindle-bearingj. Wit-hin this bearing is the spindle J, carrying at its outer end the grinding-wheel J. Splined to the other end of the spindle J is the spindle-driving pulley J2. From the pulley I to the spindle-driving pulley J 2 runs the belt J 3. The spindle-bearing has a projecting portion f, provided on its under surface with a downward projection ji, which enters and rests in a groove 7'4 in the support or frame E. In the projecting portion j? is the slot j. Through this slot and a screw-threaded orifice in the frame E passes a bolt j, by which the projection j* may be clamped to frame E at any position of the movement of the projecting portion I7'2 in the groovej4. The free end of the hanger His provided with an upwardly-inclined cam-surface h. Upon the spindle-bearing is the pro- IOO jection f. This projection j7 in the movement of the projecting portion j? of the spindle-bearing in the groovej4 will act on the cam h', swinging the hanger and the wheel I and gear g' on a center coincident with that of the wheel G. Secured to projection g is a plate K, carrying a projection g4 for centering the grinding attachment at one end upon the lathe, and K is a projection from the supportE for centering the other end of the grinding attachment upon the lathe.

L L are arms connected together by a yoke L2. These arms are swiveled in bearings LB in projections L4 from the wheel I. In the faceplate C are oriiices or slots in which these arms can enter.

The grinding attachment is connected to` the lathe in the following manner: The 'at-` tachment is first connected to the tool-rest by 1 means of `the slot f. The attachment is then brought up to the live-*center d and the deadcenter d moved up. The attachment is'adi j usted on the tool-rest until the orifice in the projection g4 coincides with the live-'centen and the orifice in the projection 'K coincides The attachment is. then clamped in that position to the tool-rest. The dead-center is then moved away and the 3 slide-rest operated to move the attachment The attach-ment 1 is then moved transversely to bring the 'projection .g4 out of alinem'ent with the live-:cen-

with the dead-center.

away from the live-center.

ter. It is then moved longitudinally 4and transversely until the grinding-wheel rests: against the side of the live-center,` when the The arms L L are entered into theslots or orifices in the face-plateand the face-plate revolved,

machine is ready to grind 'the center.

which, through the mechanism described, rotates the grinding-wheel.

the proper feed for grinding the center.

with my improved machine, all that is necessary is for the operator to move the projecting portion j? and clamp it at the desired The movement of the spindle-bearing 1 point. through the projection j* and cam lr maintains the distance between the pulleys I and J2 constant, the cam 7i being maintained -in contact with the proj ection. jl by means of the springs O. The lateral position of the two` Moving the'sli'de- E rest tran'sversely'a'nd longitudinally provides 1 In f order to vary the angle of the-grinding-wheel cede-15 actuating the latter and means to vary the an'- gular ,position of the grinding-wheel.

2. In combination with the face or drive plate of a lathe, of a driver for a center-grinding attachment, power-transmitting proj ections connecting the driver and face or drive plate, a grinding-wheel disposed between said projections and operative connection between the driver and lthe grinding-wheel for actuating the latter and means to vary the angu lar position of the grinding-wheel.

3.v In a lathe-center-grinding machine, 1n

combinationwith the grinding-wheel and a revoluble spindle for the same, of a bearing for said spindle, said bearing being supported so as to be movable toV vary the angular posi; tion of the grinding-wheel with reference to the center to be ground, a spindle-driving wheel upon the spindle, 'a driving-wheel for said spindle-'driving wheel, means 'to 'dr-ive said last-mentioned wheel and means to maintain 4a constant distance between the two wheels at all positions of the spindle.

4. In a la'the-'center-'grindin-g machine, in combination with the grinding-wheel and a revoluble spindle for the sa'me, of a bearing for said spindle said bearing being supported 'so as to be movable to vary the'angula'r position of the grinding-wheel with reference to the center to be ground, a spindle-driving wheel upon the spindle, 1a 'driving-wheel for said Vlspindle-'dri'ving wheel, means to "drive said last-mentioned wheel and connection between said wheels, a swinging hanger for the shaft of the wheel driving the spindle-driving wheel, a cam upon said hanger "and-apro-V jeetion upon the spindle-bearing adapted in its movement tos'wi'ng said hanger and rmaintain a 'constant distance between the two wheels.

5. In a lathe-center-'grinding machine, in' combination with the grinding-'wheel and a revoluble spindle for the same,- of a bearing for said spindle said bearing being supported so as to be movable to vary the angularposivtion of the grinding-wheel with reference to the 'center to be ground, a spindle-driving wheel upon the spindle, a driving-'wheel for' said spindle-driving wheel, means to drive said last-mentioned wheel and connection between said wheels, a swinging hanger Vforthe shaft of the-wheel driving the spindle-driving wheel, a 'cam upon lsaid hanger and a pro'- jection 'upon the-spindle adapted in its movementto swingfsaid hanger and maintain a constant distance between the two wheels, said wheel driving the spindle-driving'wheel being splined upon its shaft.

"6. In a lathe-center-grinding machine, in combination with the grinding-wheel and a revoluble spindle for the same, of a bearing for said spindle, a lsupport having a groove in which the bearing is movable and guided, a spindle-driving wheel upon the spindle, a driving-wheel for said spindle-driving wheel, means to drive said last-mentioned wheel and IIO connection between `said Wheels, a swinging In testimony of which inVentionIhziVe herehanger for the shaft of the Wheel driving the unto set my hand at Philadelphia on this spindle-driving WheeLacain upon said hanger 12th day 0f March, 1901.

and a projection upon the spindle-support HERMAN DOCK. adapted in its movement to swing said hanger NTitnesses:

and maintain a constant distance between the M. M. HAMILTON,

two Wheels. l G. IRWIN HUTTON. 

